California Gov. Jerry Brown (D) on Sunday said that he is not ready to legalize marijuana use in the state.

"Well, we have medical marijuana, which gets very close to what they have in Colorado and Washington. I'd really like those two states to show us how it's going to work," he said on NBC's "Meet the Press."

Brown said he was worried about what would happen to the nation if too many people used the drug too often.

"And all of a sudden, if there's advertising and legitimacy, how many people can get stoned and still have a great state or a great nation?" he asked. "The world's pretty dangerous, very competitive. I think we need to stay alert, if not 24 hours a day, more than some of the potheads might be able to put together."